Just one, but they have to steal it first.
It needed to get it's fill o' mint.
Two, but I don't know how they got in there.
Only one. But they have to sit in the dark room for a year, first, to make sure that the lightbulb is out.
3, a person, a ladder, and another lightbulb
Because they keep stealing all the green cards.
In case you get a hole-in-one (stolen from some girl at school)